body {
    display: flex;
    flex-direction: column;
}

header {
    height: 44px;
    line-height: 44px;
    background-color: rgba(248, 248, 248, 100);
    color: rgba(16, 16, 16, 100);
    font-size: 18px;
    text-align: center;
    font-family: Microsoft Yahei;

}

main {
    background: url(../../assets/imgs/bg-1.png) no-repeat center center;
    background-size: cover;
    position: relative;
    flex: 1;

    div {
        position: absolute;
        left: 250px;
        top: 20px;
        width: 105px;
        height: 40px;
        line-height: 40px;
        border-radius: 20px 20px 20px 20px;
        background-color: rgba(255, 255, 255, 100);
        text-align: center;
        border: 1px solid rgba(187, 187, 187, 100);

        .jump {
            border-left: 1px solid rgba(187, 187, 187, 100);
            padding-left: 5px;
        }
    }

    h1 {
        position: absolute;
        left: 69px;
        bottom:60px;
        color: rgba(255, 255, 255, 100);
        font-size: 36px;
        text-align: center;
        font-family: SourceHanSansSC-bold;
        animation: run 2s linear;
    }
    @keyframes run {
        0%{
            font-size: 12px;
            bottom: 200px;
            opacity: 0;
        };
        100%{
            font-size: 36px;
            bottom: 60px;
            opacity: 1;
        }
    }
}
footer{
   height: 40px;
   background: white;
}
